Subtelomeres Are Blocks of Homologous DNA Sequences Close to the Ends

Multiple Choice

Subtelomeres are blocks of homologous DNA sequences close to the ends of chromosomes. In a worldwide population of humans, when sequences of chromosomes 4q and 10q subtelomeres were analyzed only 17 4q and 8 10q haplotypes were found among African, European, and Asian groups. Which of the following might be among the results or conclusions of this analysis?

A) finding that few or no interchromosomal exchanges can occur among these chromosomes
B) a conclusion that all haplotypes were present before the human population migrated from Africa
C) reporting that haplotype polymorphism shows no response to natural selection
D) finding greater than 80% variation between homologous ends of chromosomes in humans
E) a conclusion that assigning chromosomal origin of repeat arrays by using specific restriction enzymes is possible only in a population with the same ethnic origin